Java await和sleep的区别

最新推荐文章于 2025-06-12 15:26:05 发布

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最新推荐文章于 2025-06-12 15:26:05 发布

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分类专栏： Java基础

本文链接：https://blog.youkuaiyun.com/qq_17612199/article/details/52141750

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本文通过对比使用await和sleep方法时锁的状态变化，探讨了在Java并发编程中ReentrantLock的使用方式及其对线程的影响。揭示了await方法释放锁而sleep方法保持锁的特点。

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import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

public class Main {

    public static void main(String[] args) throws InterruptedException {
        final ExecutorService exec = Executors.newFixedThreadPool(4);
        final ReentrantLock lock = new ReentrantLock();
        final Condition condition = lock.newCondition();
        final int time = 5;
        final Runnable add = new Runnable() {

            public void run() {
                System.out.println("上锁前锁的状态：" + lock);
                lock.lock();
                try {
                    condition.await(time, TimeUnit.SECONDS);
//                    Thread.sleep(5000);
                    System.out.println("上锁后锁的状态：" + lock.toString());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } finally {
                    lock.unlock();
                }
            }
        };
        for (int index = 0; index < 4; index++)
            exec.submit(add);
        exec.shutdown();
    }
}

await:

上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Unlocked]
上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Unlocked]
上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Unlocked]
上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Locked by thread pool-1-thread-3]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Locked by thread pool-1-thread-1]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Locked by thread pool-1-thread-2]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Locked by thread pool-1-thread-3]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@1091a2e2[Locked by thread pool-1-thread-4]

sleep:

上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Unlocked]
上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Unlocked]
上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Locked by thread pool-1-thread-2]
上锁前锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Locked by thread pool-1-thread-2]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Locked by thread pool-1-thread-2]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Locked by thread pool-1-thread-1]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Locked by thread pool-1-thread-4]
上锁后锁的状态：java.util.concurrent.locks.ReentrantLock@fe841b7[Locked by thread pool-1-thread-3]

结论：

wait状态不持有锁
sleep状态持有锁